Table 2. Probability of positive maternal responses in relation to grooming given by potential handler.

Independent variables	Coefficient	Z	p
Grooming given	0.72	3.91	0.001
Number of infants	−0.13	−0.49	0.126
Age of infants	0.38	0.74	0.301
Rank difference	0.25	0.66	0.249

Positive maternal responses – mother allowed a handler to interact with her infant. Other independent variables are the number of infants per OMU female, the age of the infant and the rank difference between the mother and the handler. N = 897.